diff --git a/ChangeLog b/ChangeLog
index e47b64e20b..089532ec57 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Dec  4 11:07:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_core.h (rb_vm_inc_const_missing_count): missing prototype.
+
 Sat Dec  4 08:50:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/iconv/iconv.c (Init_iconv): no warnings if $VERBOSE is nil.
diff --git a/vm_core.h b/vm_core.h
index 1a734b31e0..bf64724390 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -645,6 +645,7 @@ VALUE rb_vm_invoke_proc(rb_thread_t *th, rb_proc_t *proc, VALUE self,
 			int argc, const VALUE *argv, const rb_block_t *blockptr);
 VALUE rb_vm_make_proc(rb_thread_t *th, const rb_block_t *block, VALUE klass);
 VALUE rb_vm_make_env_object(rb_thread_t *th, rb_control_frame_t *cfp);
+void rb_vm_inc_const_missing_count(void);
 void rb_vm_gvl_destroy(rb_vm_t *vm);
 
 void rb_thread_start_timer_thread(void);